Biotin+Plasmid

Hi every one
I was wondering if there is any kit out there that uses biotin for
labeling DNA probes (like PCR products) and using Streptavidin coated
magnetic beads for isolation of the corresponding plasmid from a
library. I know Gibco has the GeneTrapper kit for cDNA, but it has other
components that I do not need, so it makes that kit expensive. I would
apprecite if you know any supplier and give me the address.
Yours Mahmood mpiraee at is2.dal.ca